CN111020558B - Multi-metal composite coating with high bonding strength with substrate and preparation method thereof - Google Patents
Multi-metal composite coating with high bonding strength with substrate and preparation method thereof Download PDFInfo
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- 238000000576 coating method Methods 0.000 title claims abstract description 102
- 239000011248 coating agent Substances 0.000 title claims abstract description 100
- 239000000758 substrate Substances 0.000 title claims abstract description 35
- 239000002905 metal composite material Substances 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 129
- 239000002131 composite material Substances 0.000 claims abstract description 44
- 229910000990 Ni alloy Inorganic materials 0.000 claims abstract description 17
- 239000011159 matrix material Substances 0.000 claims abstract description 17
- 229910001119 inconels 625 Inorganic materials 0.000 claims abstract description 9
- 229910000816 inconels 718 Inorganic materials 0.000 claims abstract description 7
- 238000005507 spraying Methods 0.000 claims description 65
- 238000010288 cold spraying Methods 0.000 claims description 38
- 238000010438 heat treatment Methods 0.000 claims description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 239000007789 gas Substances 0.000 claims description 16
- 238000005488 sandblasting Methods 0.000 claims description 14
- 229910045601 alloy Inorganic materials 0.000 claims description 12
- 239000000956 alloy Substances 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 229910052593 corundum Inorganic materials 0.000 claims description 10
- 239000010431 corundum Substances 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 5
- 238000005260 corrosion Methods 0.000 abstract description 16
- 230000007797 corrosion Effects 0.000 abstract description 15
- 239000002245 particle Substances 0.000 abstract description 12
- 239000003518 caustics Substances 0.000 abstract description 4
- 229910007567 Zn-Ni Inorganic materials 0.000 abstract description 2
- 229910007614 Zn—Ni Inorganic materials 0.000 abstract description 2
- 238000000280 densification Methods 0.000 abstract description 2
- 238000005137 deposition process Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000011065 in-situ storage Methods 0.000 abstract description 2
- 239000011148 porous material Substances 0.000 abstract description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 17
- 239000011701 zinc Substances 0.000 description 16
- 238000012360 testing method Methods 0.000 description 12
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000010410 layer Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 238000009864 tensile test Methods 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000007788 roughening Methods 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/02—Coating starting from inorganic powder by application of pressure only
- C23C24/04—Impact or kinetic deposition of particles
- C23C24/045—Impact or kinetic deposition of particles by trembling using impacting inert media
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/06—Alloys containing less than 50% by weight of each constituent containing zinc
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention relates to a multi-metal composite coating with high bonding strength with a substrate and a preparation method thereof, wherein the multi-metal composite coating is prepared from 30-50% by mass, 10-30% by mass, 10-20% by mass, 5-15% by mass and 15-20% by mass of Al powder, Zn powder, Ni powder, Ta powder and Ni alloy powder, wherein the Ni alloy powder is Inconel 625 or Inconel 718. The components in the composite coating form an organic whole, the bonding strength with a matrix is high, gradient hardness Ta particles and Ni alloy particles realize in-situ densification effect on deposited Al-Zn-Ni in the deposition process, the compactness of the coating is improved, the porosity of the coating is extremely low, corrosive substances are not easy to enter the matrix through pores to corrode when the composite coating is used in an environment with corrosive substances for a long time, and the corrosion resistance is stable.
Description
The invention is a divisional application with patent application number 201910242535.2 entitled "a high corrosion resistant composite coating and a preparation method thereof".
Technical Field
The invention relates to the technical field of material surface coating preparation.
Background
Cold spraying is a novel surface coating preparation method, has the advantages of low deposition temperature, high coating bonding strength, no oxidation and the like, is an ideal technology for preparing coatings made of soft temperature-sensitive materials such as aluminum, zinc, nickel and the like, and is widely applied to preparing corrosion-resistant coatings made of Al, Zn, Ni and the like. Although the compactness of the coating can be improved by adding the ceramic particles into the metal phase, the ceramic particles exist in the coating in a mechanical embedding mode and do not form an organic whole with the metal phase, and the condition that the particles fall off to cause point corrosion of the coating still occurs in the corrosion process.
Disclosure of Invention
The invention aims to provide a multi-metal composite coating with high bonding strength with a substrate.
The invention also aims to provide a preparation method of the multi-metal composite coating.
In order to achieve the purpose, the invention provides the following technical scheme:
a multi-metal composite coating with high bonding strength with a substrate is characterized in that: the alloy is prepared from 30-50% by mass, 10-30% by mass, 10-20% by mass, 5-15% by mass and 15-20% by mass of Al powder, Zn powder, Ni powder, Ta powder and Ni alloy powder; the Ni alloy powder is Inconel 625 or Inconel 718; the particle diameters of the Al powder, the Zn powder and the Ni powder are preferably 5-45 μm, and the particle diameters of the Ta powder and the Ni alloy powder are preferably 15-75 μm.
The multi-metal composite coating is obtained by uniformly mixing the Al powder, the Zn powder, the Ni powder, the Ta powder and the Ni alloy powder, spraying the mixture on the surface of the matrix subjected to sand blasting and roughening treatment by adopting low-pressure cold spraying, and then carrying out heat treatment.
The inventor has found that, because of the high hardness and difficult deformation of Ta metal and Ni alloy, the existing method usually adopts high-pressure cold spraying (generally more than 3 MPa) to prepare a single Ta metal coating and a single Ni alloy coating, and the equipment has the disadvantages of huge requirement, high cost, incapability of being held by hand like low-pressure spraying and inconvenient operation. The invention combines the process characteristics of low-pressure cold spraying, creatively adopts a specific raw material powder composite formula, and adds dual-phase gradient hardness non-ceramic reinforced particles (hard reinforced phase) in a multi-element corrosion-resistant metal phase (binding phase), thereby realizing the low-pressure spraying method with low cost and convenient operation, and simultaneously matching with two-stage heat treatment to obtain the high-corrosion-resistant composite coating with excellent product performance.
The preparation method of the multi-metal composite coating is characterized by sequentially comprising the following steps of:
(1) putting the Al powder, the Zn powder, the Ni powder, the Ta powder and the Ni alloy powder into a mechanical mixer, and uniformly mixing to obtain spraying powder;
(2) spraying the spraying powder onto the surface of the matrix subjected to sand blasting coarsening treatment by adopting low-pressure cold spraying to form a cold spraying composite coating; in the low-pressure cold spraying operation, the working gas is nitrogen, the spraying pressure is 0.6-1.2 MPa, the temperature of the working gas is 200-600 ℃, the spraying distance is 10-30 mm, the spraying angle is 60-90 degrees, the moving speed of the spray gun is 10-50 mm/s, the offset of adjacent passes is 1-3 mm, and the powder feeding rate is 0.5-3 g/s. The offset of the adjacent pass refers to that after the single-pass spraying width of the low-pressure cold spraying is set, the spray gun needs to offset a certain distance after each pass of spraying is finished and then sprays the next pass, so that a complete coating is formed repeatedly, and the offset distance of the adjacent pass is the offset of the adjacent pass.
(3) Carrying out heat treatment on the cold spraying composite coating to obtain a high-corrosion-resistance composite coating with the thickness of 5-500 mu m; the heat treatment operation is specifically two-stage vacuum heat treatment, wherein the vacuum degree of the first-stage heat treatment is 20-200 Pa, the temperature is 250-380 ℃, the treatment time is 30-180 min, the vacuum degree of the second-stage heat treatment is kept unchanged, the temperature is 420-450 ℃, and the treatment time is 5-60 min.
When the coating is sprayed specifically, the adjacent passes are overlapped to form a first layer of coating, and then a second layer, a third layer and an … … N layer are continuously prepared on the basis, the spraying can be stopped when the designed thickness is reached, the spraying powder can be added at any time in the process, and heat treatment is carried out after the spraying of all the passes is finished, so that the high-corrosion-resistance composite coating is finally prepared.
Specifically, the preparation method of the multi-metal composite coating is characterized by sequentially comprising the following steps of:
(1) placing 30-50% by mass, 10-30% by mass, 10-20% by mass, 5-15% by mass and 15-20% by mass of Al powder, Zn powder, Ni powder, Ta powder and Ni alloy powder in a mechanical mixer, and uniformly mixing to obtain spraying powder; the particle diameters of the Al powder, the Zn powder and the Ni powder are 5-45 μm, and the particle diameters of the Ta powder and the Ni alloy powder are 15-75 μm;
(2) spraying the spraying powder onto the surface of the matrix subjected to sand blasting coarsening treatment by adopting low-pressure cold spraying to form a cold spraying composite coating; in the low-pressure cold spraying operation, the working gas is nitrogen, the spraying pressure is 0.6-1.2 MPa, the temperature of the working gas is 200-600 ℃, the spraying distance is 10-30 mm, the spraying angle is 60-90 degrees, the moving speed of the spray gun is 10-50 mm/s, the offset of adjacent passes is 1-3 mm, and the powder feeding rate is 0.5-3 g/s;
(3) and (3) carrying out two-stage vacuum heat treatment on the cold spraying composite coating, wherein the vacuum degree of the first-stage heat treatment is 20-200 Pa, the temperature is 250-380 ℃, the treatment time is 30-180 min, the vacuum degree of the second-stage heat treatment is kept unchanged, the temperature is 420-450 ℃, and the treatment time is 5-60 min, so that the multi-metal composite coating with the thickness of 5-500 mu m is obtained.
The invention has the following beneficial effects:
the invention provides a multi-metal composite coating with high bonding strength with a substrate, wherein each component in the composite coating forms an organic whole, the bonding strength with the substrate is high (more than 50 MPa), the multi-metal composite coating does not fall off, the gradient hardness Ta particles and Ni alloy particles realize in-situ densification effect on deposited Al-Zn-Ni in the deposition process, the compactness of the coating is improved, the porosity of the coating is extremely low, when the multi-metal composite coating is used in an environment with corrosive substances for a long time, the corrosive substances are not easy to enter the substrate through pores to corrode, and the corrosion resistance is stable. The invention also provides a preparation method of the multi-metal composite coating, the preparation method has low cost and very convenient operation, and the composite coating prepared by the method has high bonding strength with a matrix, compact structure and excellent corrosion resistance, and is an ideal surface protective coating for the surface of a steel member.
Drawings
Fig. 1 is a cross-sectional structure of the multi-metal composite coating layer prepared in example 1 of the present invention.
Detailed Description
The invention is further described in the following examples, which are not intended to limit the invention thereto.
Example 1
A preparation method of a multi-metal composite coating with high bonding strength with a substrate sequentially comprises the following steps:
(1) carrying out oil and rust removal treatment on the Q235 steel substrate, and then carrying out sand blasting coarsening treatment on brown corundum or white corundum;
(2) placing 40%, 10%, 20%, 15% and 15% of Al powder, Zn powder, Ni powder, Ta powder and Inconel 625 alloy powder in a mechanical mixer, and uniformly mixing to obtain spraying powder; the grain sizes of the Al powder, the Zn powder and the Ni powder are 5-45 mu m, and the grain sizes of the Ta powder and the Inconel 625 alloy powder are 15-75 mu m;
(3) spraying the uniformly mixed spraying powder onto the surface of the matrix subjected to sand blasting coarsening treatment by adopting low-pressure cold spraying to form a cold spraying composite coating; in the low-pressure cold spraying operation, the working gas is nitrogen, the spraying pressure is 0.8MPa, the temperature of the working gas is 200 ℃, the spraying distance is 15mm, the spraying angle is 90 degrees, the moving speed of a spray gun is 10mm/s, the offset of adjacent passes is 3mm, the powder feeding speed is 3g/s, and the spraying is stopped when the thickness of the coating reaches 200 mu m;
(4) and (3) placing the coating component obtained after low-pressure cold spraying in a vacuum heat treatment furnace, adjusting the temperature to 300 ℃ and the vacuum degree to 20Pa, preserving the heat for 30min, keeping the vacuum degree unchanged, heating to 440 ℃, preserving the heat for 20min, and cooling to the temperature below 80 ℃ along with the furnace to take out the coating component.
The porosity of the composite coating obtained in the embodiment is 0.29% by reference to ASTM E2109-2000 standard test, and the corrosion resistance is 3500h without obvious corrosion by reference to GB/T10125-. The following test methods were used to determine the bond strength of the composite coating to the substrate surface: preparing the composite coating on the surface of the Q235 steel substrate in the example of a standard circular sheet with the diameter of 25mm, bonding a round rod on the outer surfaces of the composite coating and the substrate, pulling the composite coating and the substrate apart by using a tensile testing machine, and testing the bonding strength; the test result shows that the bonding strength of the composite coating and the matrix is up to 52 MPa. The cross-sectional structure of the multi-metal composite coating prepared in this example is shown in fig. 1.
Example 2
A preparation method of a multi-metal composite coating with high bonding strength with a substrate sequentially comprises the following steps:
(1) carrying out oil and rust removal treatment on the 35CrMo steel substrate, and then carrying out sand blasting coarsening treatment on brown corundum or white corundum;
(2) placing 30 percent, 20 percent, 10 percent and 20 percent of Al powder, Zn powder, Ni powder, Ta powder and Inconel 625 alloy powder in a mechanical mixer, and uniformly mixing to obtain spraying powder; the grain sizes of the Al powder, the Zn powder and the Ni powder are 5-45 mu m, and the grain sizes of the Ta powder and the Inconel 625 alloy powder are 15-75 mu m;
(3) spraying the uniformly mixed spraying powder onto the surface of the matrix subjected to sand blasting coarsening treatment by adopting low-pressure cold spraying to form a cold spraying composite coating; in the low-pressure cold spraying operation, the working gas is nitrogen, the spraying pressure is 0.9MPa, the temperature of the working gas is 300 ℃, the spraying distance is 15mm, the spraying angle is 90 degrees, the moving speed of a spray gun is 10mm/s, the offset of adjacent passes is 3mm, the powder feeding speed is 1.5g/s, and the spraying is stopped when the thickness of the coating reaches 200 mu m;
(4) and (3) placing the coating component obtained after low-pressure cold spraying in a vacuum heat treatment furnace, adjusting the temperature to 300 ℃ and the vacuum degree to 120Pa, preserving the heat for 30min, keeping the vacuum degree unchanged, heating to 420 ℃, preserving the heat for 25min, and cooling to the temperature below 80 ℃ along with the furnace to take out the coating component.
The porosity of the composite coating obtained in the embodiment is 0.43% by reference to ASTM E2109-200 standard test, and the corrosion resistance is 2000h without obvious corrosion by reference to GB/T10125-. The following test methods were used to determine the bond strength of the composite coating to the substrate surface: preparing the composite coating on the surface of the 35CrMo steel substrate in the example of a standard circular sheet with the diameter of 25mm, bonding a round rod on the outer surfaces of the composite coating and the substrate, pulling the composite coating and the substrate apart by using a tensile testing machine, and testing the bonding strength; the test result shows that the bonding strength of the composite coating and the matrix is as high as 53 MPa.
Example 3
A preparation method of a multi-metal composite coating with high bonding strength with a substrate sequentially comprises the following steps:
(1) carrying out oil and rust removal treatment on a 30CrMnSiA steel matrix, and then carrying out sand blasting and coarsening treatment by adopting brown corundum or white corundum;
(2) placing 50 percent, 20 percent, 10 percent, 5 percent and 15 percent of Al powder, Zn powder, Ni powder, Ta powder and Inconel718 alloy powder in a mechanical mixer, and uniformly mixing to obtain spraying powder; the grain sizes of the Al powder, the Zn powder and the Ni powder are 5-45 mu m, and the grain sizes of the Ta powder and the Inconel718 alloy powder are 15-75 mu m;
(3) spraying the uniformly mixed spraying powder onto the surface of the matrix subjected to sand blasting coarsening treatment by adopting low-pressure cold spraying to form a cold spraying composite coating; in the low-pressure cold spraying operation, the working gas is nitrogen, the spraying pressure is 0.8MPa, the temperature of the working gas is 300 ℃, the spraying distance is 15mm, the spraying angle is 90 degrees, the moving speed of a spray gun is 10mm/s, the offset of adjacent passes is 3mm, the powder feeding speed is 0.8g/s, and the spraying is stopped when the thickness of the coating reaches 200 mu m;
(4) and (3) placing the coating component obtained after low-pressure cold spraying in a vacuum heat treatment furnace, adjusting the temperature to 350 ℃ and the vacuum degree to 150Pa, preserving the heat for 150min, keeping the vacuum degree unchanged, heating to 450 ℃, preserving the heat for 25min, and cooling to the temperature below 80 ℃ along with the furnace to take out the coating component.
The porosity of the composite coating obtained in the embodiment is 0.52% according to ASTM E2109-200 standard test, and the corrosion resistance is not obviously corroded for 3000h according to GB/T10125-. The following test methods were used to determine the bond strength of the composite coating to the substrate surface: preparing the composite coating on the surface of the 30CrMnSiA steel substrate in the example of a standard circular sheet with the diameter of 25mm, bonding a round rod on the outer surfaces of the composite coating and the substrate, pulling the composite coating and the substrate apart by using a tensile testing machine, and testing the bonding strength; the test result shows that the bonding strength of the composite coating and the matrix is as high as 55 MPa.
Example 4
A preparation method of a multi-metal composite coating with high bonding strength with a substrate sequentially comprises the following steps:
(1) carrying out oil and rust removal treatment on the 30CrNi2MoV steel substrate, and then carrying out sand blasting roughening treatment on brown corundum or white corundum;
(2) placing 50 percent, 10 percent and 20 percent of Al powder, Zn powder, Ni powder, Ta powder and Inconel718 alloy powder in a mechanical mixer, and uniformly mixing to obtain spraying powder; the grain sizes of the Al powder, the Zn powder and the Ni powder are 5-45 mu m, and the grain sizes of the Ta powder and the Inconel718 alloy powder are 15-75 mu m;
(3) spraying the uniformly mixed spraying powder onto the surface of the matrix subjected to sand blasting coarsening treatment by adopting low-pressure cold spraying to form a cold spraying composite coating; in the low-pressure cold spraying operation, the working gas is nitrogen, the spraying pressure is 1.0MPa, the temperature of the working gas is 500 ℃, the spraying distance is 15mm, the spraying angle is 90 degrees, the moving speed of a spray gun is 10mm/s, the offset of adjacent passes is 3mm, the powder feeding speed is 1.8g/s, and the spraying is stopped when the thickness of the coating reaches 200 mu m;
(4) and (3) placing the coating component obtained after low-pressure cold spraying in a vacuum heat treatment furnace, adjusting the temperature to 350 ℃ and the vacuum degree to 20Pa, preserving the heat for 120min, keeping the vacuum degree unchanged, heating to 450 ℃, preserving the heat for 35min, and cooling to the temperature below 80 ℃ along with the furnace to take out the coating component.
The porosity of the composite coating obtained in the embodiment is 0.45% by reference to ASTM E2109-200 standard test, and the corrosion resistance is 2400h without obvious corrosion by reference to GB/T10125-. The following test methods were used to determine the bond strength of the composite coating to the substrate surface: preparing the composite coating on the surface of the 30CrNi2MoV steel substrate in the example of a standard circular sheet with the diameter of 25mm, bonding a round rod on the outer surfaces of the composite coating and the substrate, pulling the composite coating and the substrate apart by using a tensile testing machine, and testing the bonding strength; the test result shows that the bonding strength of the composite coating and the matrix is as high as 55 MPa.
Claims (3)
1. A multi-metal composite coating with high bonding strength with a substrate is characterized in that: the alloy is prepared from 30-50% by mass, 10-30% by mass, 10-20% by mass, 5-15% by mass and 15-20% by mass of Al powder, Zn powder, Ni powder, Ta powder and Ni alloy powder; the Ni alloy powder is Inconel 625 or Inconel 718; the grain sizes of the Al powder, the Zn powder and the Ni powder are all 5-45 mu m, and the grain sizes of the Ta powder and the Ni alloy powder are all 15-75 mu m.
2. The method for preparing the multi-metal composite coating with high bonding strength with the substrate according to claim 1, which comprises the following steps in sequence:
(1) putting the Al powder, the Zn powder, the Ni powder, the Ta powder and the Ni alloy powder into a mechanical mixer, and uniformly mixing to obtain spraying powder;
(2) spraying the spraying powder onto the surface of the matrix subjected to sand blasting coarsening treatment by adopting low-pressure cold spraying to form a cold spraying composite coating; in the low-pressure cold spraying operation, the working gas is nitrogen, the spraying pressure is 0.6-1.2 MPa, the temperature of the working gas is 200-600 ℃, the spraying distance is 10-30 mm, the spraying angle is 60-90 degrees, the moving speed of a spray gun is 10-50 mm/s, the offset of adjacent passes is 1-3 mm, and the powder feeding rate is 0.5-3 g/s; the offset of the adjacent pass refers to that after the single-pass spraying width of the low-pressure cold spraying is set, the spraying gun needs to offset a certain distance after each pass of spraying and then sprays the next pass, so that a complete coating is formed repeatedly, and the offset distance of the adjacent pass is the offset of the adjacent pass; when the coating is sprayed specifically, a first layer of coating is formed by overlapping adjacent passes, and on the basis, a second layer, a third layer and an … … Nth layer are continuously prepared, and spraying is stopped when the designed thickness is reached;
(3) carrying out heat treatment on the cold spraying composite coating to obtain a multi-metal composite coating with the thickness of 5-500 mu m; the heat treatment operation is specifically two-stage vacuum heat treatment, wherein the vacuum degree of the first-stage heat treatment is 20-200 Pa, the temperature is 250-380 ℃, the treatment time is 30-180 min, the vacuum degree of the second-stage heat treatment is kept unchanged, the temperature is 420-450 ℃, and the treatment time is 5-60 min.
3. The preparation method of the multi-metal composite coating with high bonding strength with the substrate is characterized by sequentially comprising the following steps of:
(1) carrying out oil and rust removal treatment on the Q235 steel substrate, and then carrying out sand blasting coarsening treatment on brown corundum or white corundum;
(2) placing 40%, 10%, 20%, 15% and 15% of Al powder, Zn powder, Ni powder, Ta powder and Inconel 625 alloy powder in a mechanical mixer, and uniformly mixing to obtain spraying powder; the grain sizes of the Al powder, the Zn powder and the Ni powder are 5-45 mu m, and the grain sizes of the Ta powder and the Inconel 625 alloy powder are 15-75 mu m;
(3) spraying the uniformly mixed spraying powder onto the surface of the matrix subjected to sand blasting coarsening treatment by adopting low-pressure cold spraying to form a cold spraying composite coating; in the low-pressure cold spraying operation, the working gas is nitrogen, the spraying pressure is 0.8MPa, the temperature of the working gas is 200 ℃, the spraying distance is 15mm, the spraying angle is 90 degrees, the moving speed of a spray gun is 10mm/s, the offset of adjacent passes is 3mm, the powder feeding speed is 3g/s, and the spraying is stopped when the thickness of the coating reaches 200 mu m;
(4) and (3) placing the coating component obtained after low-pressure cold spraying in a vacuum heat treatment furnace, adjusting the temperature to 300 ℃ and the vacuum degree to 20Pa, preserving the heat for 30min, keeping the vacuum degree unchanged, heating to 440 ℃, preserving the heat for 20min, and cooling to the temperature below 80 ℃ along with the furnace to take out the coating component.
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| CN111541125A (en) * | 2020-05-08 | 2020-08-14 | 丰实新能源材料成都有限公司 | Manufacturing method of novel copper-aluminum transition electric connecting wire clamp |
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| CN109972020B (en) | 2019-12-24 |
| CN109972020A (en) | 2019-07-05 |
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